Edward lynch



UNITED- STATES PATENT OFFICE;V

EDIVARD LYNCH, OF WIASHINGTON,.DISTRICT OF COLUMBIA.

IMPROVEMENT -IN STEAMi-B'OILE'RSL.

Specification forming part of Letters Patent No. 23,593, dated April 12,1859:

To all whom it may concern:

Be it known that I, EDWARD LYNCH, of the city of IVashington, in theDistrict ot' Columbia, have invented a new and useful Improvement inCirculating Vater and Generating Steam in Boilers of Steam-Engines; andI do hereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters and marks thereon.

My invention is more especially designed for the boilers of marineengines, though itis applicable to other boilers, to those ofnoncondensing as Well as of condensing engines.

In the boilers of marine engines, as also in the long-flue boilers ofthe high-pressure engine used on the Vestern Waters of this country,there is a water-space underneath the grate and ash-pit in communicationwith Water-spaces at the sides of the fire-box or furnace and the mainWaterspace of the boiler. `Without resort to some unusual means thewater in the space underneath the ash-pit Will have little or nocirculation and the space will become the recipient of the saline,earthy, and other deposits. By' my invention the water in the spacealluded to will have free and full circulation, and deposits therein beprevented.

My invention is designed, also, to aid materially in getting up steam inall large boilers, and to remedy the evil that occurs to marine-engineboilers by the expansion and contraction of the metal While the boileris passing from the one to the other condition ot' use and rest.

My invention further is designed to make up the deficiency which occursin the water of the boilers of marine engines.

Of the drawings forming part of this specification, Figure lis a frontview of a main boiler and of an auxiliary boiler, and Fig. 2 a verticalsectional view of a main boiler having horizontal fire-tubes.

In both of the figures like letters refer to like parts.

The shell of the boiler is marked a., the smoke-stack b, the grate c,the ash-pit cl, the steam-space of the boiler e, the water-spacef, whichis also indicated by blue coloring. The

body of the main boiler is marked G and the body of the auxiliary boilerH. In general construct-ion neither of these boilers differs from manyin use. Y

It will be perceived that a piped is counected to the steam-space partof the auxiliary boiler H and to the main boiler below the ash-pit, thusmaking a communication between the steam-space of the auxiliary boilerand the water-spaces of the main boiler be- 10W the ashpit. Fig. 2 showsthe pipe iperforated and passed to some extent in thewater under theash-pit. The arrows in the blue part of Fig. l indicate the passage ofsteam through the perforations of the pipe. Cocks j and coupling-piecesk are shown at various parts of this pipe.

Ocean steamers usually have an auxiliary boiler and engine for generalpurposes. Sometimes the boiler is of the same size as the other boilersand is used for generating steam for the main or auxiliary engine, ascircumstances may demand. The Steamers of the Vestern waters of thiscountry usually have an auxiliary engine, called the donkey or doctor,and used commonly for. feeding Water to the main boilers of the engine.Both in the ocean and lVestern Steamers these auxiliary engines andboilers are kept in service when the vessel is at the Wharf or in doek,though at times more steam is generated in the auxiliary boiler than canbe used by the engine. The steam in the auxiliary boiler is usually othigher pressure than that in the main boilers, and when not so neededfor ordinary purposes it can readily be so made to answer the purposesof this invention.

Through the pipe i the steam of the auxihf iary boiler can be passedinto the Water-space belowT the ash-pit of the main boiler. This steam,passing through the perforations of the pipe into the Water, willnecessarily produce an active circulation of the water in this space andprevent the accumulation of any sediment at this part ot the boiler. Thewater thus acted upon by the steam will have an upward motion given toit, and thus greatly aid in the early generation oi the steam whengetting up steam. The steam thus passed into the main boiler from theauxiliary boiler in ocean Steamers having surface-condensers will fullymake up for all losses of the water of the main boilers, and thus insurean ample supply of pure water to the main boilers. A

vessel leaving port with pure or fresh Water in her main boilers canarrive at her destination Without having rendered that Water ChargedWith alkaline or other matters, as the use of salt Water on the voyagecan be limited entirely to the auxiliary boiler; and Where herarrangement of main boilers is sneh as allows of the use of one or theother of them as au auxiliary boiler, as circumstances may demand, theWater in'all the boilers can be as fresh and pure as when she started onthe voyage. After arriving at port, or when in port, the steam from theauxiliary boiler can be made very serviceable in preventing the toorapid cooling down ot the main boilers on the putting out of their tiresorin heating them up for any purposes.

In naval Steamers the passing into the Water-space of the main boilersthe steam ofthe auxiliary boiler, as herein set out, can be substitutedto a considerable extent for bank-V ing the fires under allcircumstances and conditions where banking would be required.

Having thus fully described the eharaeter and the advantages of myinvention, what I Claim as new, and desire to secure by LettersCirculating the Water and aiding the generating of steam in the mainboilers of ocean Steamers by passing the steam from the steamspaee of anauxiliary boilerinto the Water of the water-space below the ash-pit ofthe main boilers, as herein set forth. y

' EDVARD LYNCH.

Witnesses:

T. T. EVERETT, F. S. MYER.

